Spring-lock.



No. 640,984. Patented Jan. 9, I900.

c. m. F. ANDERSEN.

SPRING LOCK.

(Application filed. Sept. 30, 189B.)

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I' pp PATENT rice.

SPRING-LOCK.

SPECIFICATION forming part of Letters Patent No. 640,984, dated January 9, 1900.

Application filed September 30, 1898. $erial No. 692,270. (No model.)

To all whom, it may concern.-

Be it known that I, CARL MAGNUS FREDE ANDERSEN, engineer, of 22 Rorholmsgade, Copenhagen, in the Kingdom of Denmark, have invented certain new and useful Improvements in Spring-Locks, of which the following is a specification.

The object of the present invention is a device in connection with spring-locks of the Yale system whereby it is made possible after the door has been shut to secure the bolt in its forward position in such a manner that it will be quite impossible by any undue influence from the outside to push the same backward, and thereby open the door, it being quite possible by the present spring-locks of the Yale system, for example, by inserting a flat tool between the door and the door-frame or by introducing through a hole in the door a suitable instrument that may catch hold of the knob, to open the door. This drawback is entirely obviated by the present invention.

In order to make the invention clear, it is necessary, in the first instance, to describe the mechanism of an ordinary spring-lock of the Yale system, such as illustrated on the accompanying drawings, in which Figure 1 shows the locking mechanism seen from above. Fig. 2 shows a section on line 1 1 in Fig. 1. Fig. 3 is a plan view of the lock including my improvements, and Fig. 4 is a section on line 2 2.

a is the lock-casing, and b the sliding bolt, actuated by a spiral spring 0, one end of which is pressing against a breast on the bolt and the other end against a cross-bar d in the casing. The rear of the bolt is formed as aforked link 6, the ends of the branches being bent inward, so as to form hooks ff. In the bottom part of the casing is further arranged a spindle h, carrying at one end a knob 't', by means of which the spindle may be turned around from the inner side of the door. The other end of the spindle is provided with a plate 0, shaped so as to present two projections just in front of the above-mentioned hooks f f. Another plate 19 of the same shape as o'is fixed onto the lower extremity of a plate 70, Fig. 2, the upper end of which is, in a suitable manner, connected with the locking-cylinder, that is not shown on the drawings. The two plates 0 and p may thus be turned quite independently of one another, and it is obvious that the bolt maybe pulled in or withdrawn either by turning the knob t' and the plate 0, connected therewith, or by turning the plate is, connected with the plate 19, and the locking-cylinder. In the former case the lock is opened from the inside and in the latter case from the outside.

In the ordinary locks of the Yale system the plates 0 and p remain in the same position in front of the hooks fand f as shown on Figs. 1 and 2, and it is evident that nothing will prevent the bolt from being pushed backwardit' in some way or other the bolthead projecting beyond the casing is actuated upon 'by means of a flat tool inserted between the door and the door-frame. The object of the present invention, that is illustrated in Figs. 3 and 4, is to prevent such an undue mode of opening, and it consists in arranging a suitable stopping device behind the hook f. With this purpose in view the spindle h, besides being arranged to turn around, is also made movable in the direction of its axis, so that it may be pulled out a certain distance in the direction shown by the arrow in Fig. 4. The spindle 7t instead of being provided with the plate 0 is provided with an arm g of the shape shown in Fig. 3, and between this arm and the bottom of the lock-casing is arranged a spiral spring m, that is compressed whenever the knob z' is pulled out. In the lower part of the hookf is cut an angular notch n, which will allow the arm 9 to pass the hook f when the spindle h is pulled out and turned. The hook f is at its upper part provided with an angular notch 42, leaving passage for the arm g when this is in the outer normal position, as shown in Fig. 4.

The distance through which the spindle it may move in the direction of its axis is limited in a suitable manner, as by the whollycompressed spring m. The plate 19 on the extremity of the plate 70, Figs. 1 and 2, is omitted, and the free end of the plate projects into an incision I, made in the upper end of the spindle h. This incision is at the center of nearly the same width as the plate 70, but a trifle greater, and is from there to the periphery enlarged so as to form angleso on the right and left side of the line indicating the central position of the plate It, as shown in Fig. 3. This shape of the incision will allow the spindle h, together with the arm g, to be turned around a certain distance before the movement is impeded by the plate 70, that ICC is kept in position by the locking-cylinder. The angle o of the incision, Fig. 3, is of such a size that the arm 9 can move from the position 9 to that of g, while at the same time the sloping sides of the incision are. moving through the angle '7). The mechanism works as follows:

If the lock has to be shut from the outside after the door has been closed, a complete turn is given to the key in the direction shown by the arrow in Fig. 3. key the locking-cylinder and the plate 7c are turned, and as soon as the plate 7.0 has been turned through the angle D it will meet the sloping surface of theincision land then carry with it the spindle 71.. When the key has made one complete turn and is removed from the lock, the tumbler can again fall into the locking-cylinder, and the lock will be shut.

The arm is now in the osition and cannot be turned backward, as the-platdk, that is kept in position by the locking-cylinder, will prevent a corresponding turning of the spindle h. When in this position, the arm 9 will prevent the bolt from being pushed backward by any outside influence. The opening of the lock is effected from the outside by giving the key a complete turn in the direction opposite to the one indicated by the arrow in Fig. 3. The same operation may be effected from the inside by first pulling the spindle h forward by means of the knob t' in the direction of the arrow shown in Fig. 4 until the arm g is standing opposite the notch 01. The spindle h is then turned in the direction shown by the arrow in Fig. 3, the arm 9 passing through the notch '11. On account of the above-described shape of the incision Z the partial turning of the spindle it may be effected without influencing the plate 7i). Actuated by the spring on the spindle will assume its normal position, and thus bring the arm 9 in front of the hook f, as shown in Fig. 3, the two other surfaces of the incision now adjoining the plate 70. The spindle h, not being prevented from doing so by the plate 70, may now be turned in the direction opposite to the one shown by the arrow in Fig. 3,whereby the arm g pulls backward the bolt 1), and the door is opened.

If it is desired to shut the look from the inside, the arm 9 is first brought into the position g by pulling the knob 4. until the arm 9 is opposite the notch n and then turning the spindle h in the direction opposite to the one shown by the arrow in Fig. 3 until it assumes the position g. By now letting the spindle it move longitudinally back to its normal position through the action of the spring m the arm g will be placed directly behind the hook, a further movement of the spindle h in the direction opposite to the one shown by the arrow in Fig. 3 being prevented by the plate 70. The bolt will therefore in this case also be secured against being pushed backward by unauthorized means.

The notches n and n are arranged in such pulled out from same.

Together with the a manner that the bolt mechanism may be reversed, so that the lock will be either right or left hand.

For the purpose of bringing the arm 9 from the position g to g, and vice versa, the spindle h may also be arranged so as to be pushed in against the lock-casing instead of being The notches n and n must in this case be arranged accordingly.

I claim 1. In a lock, the combination of a lock-casing, a bolt, a spring normally projecting the bolt, a narrow hook, carried by said bolt, a retractable spindle, a spring pressingthe same forward, an arm g fixed on the spindle normally in position to engage 'the narrow hook when moved by turning said spindle, said arm not being in position to engage the hook when the spindle is retracted, and means for turning the spindle.

2. In a lock, the combination of a lock-casing, a bolt, a spring normally projecting the bolt, a narrow hook, carried by said bolt, a retractable spindle, a spring pressing the same forward, an arm 9 fixed on the spindle normally in position to engage the narrow hook when moved by turning said spindle, said arm not being in position to engage the book when the spindle is retracted, and means at each end of the spindle for turning it.

3. In a lock, the combination of alock-casing, a bolt, a spring projecting the bolt, narrow hooksf, f arranged diagonally from each other and carried by the bolt, a spindle, a spring projecting it, an arm on the spindle to cooperate with one or other of said hooks when turned, means for turning the spindle, and means for moving the spindle longitudinally against its spring.

4. In a lock, abolt, a locking device for preventing unauthorized retraction of the bolt consisting of a narrow hook f, spindle h movable on its axis and longitudinally, arm g normally in the plane of the hook but moved out of said plane by longitudinal movement of the spindle, and spring in on said spindle.

5. ,The combination with plate 70, of spindle it having an incision Z into which plate extends, incision Z at its center being of the same width as plate k, and from the center to the surface of the spindle being enlarged on opposite sides of plate It so as to form angles v on the right and left sides of plate 70, whereby spindle it can be partly turned before being impeded by plate 76, an arm g on the spindle, a bolt, a hook f carried thereby, arm g being normally in position to allow retraction of the bolt and movable into position to lock the bolt projected without movement of plate 7c.

Signed at Copenhagen, Denmark, this 12th day of September, 1898.

CARL MAGNUS FREDE ANDERSEN.

Witnesses:

ERNEST BALLARD, J ULES BLOIR. 

